69230 Hermes
Sub-kilometer sized asteroid and binary system on an eccentric orbit / From Wikipedia, the free encyclopedia
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69230 Hermes is a sub-kilometer sized asteroid and binary system on an eccentric orbit,[10] classified as a potentially hazardous asteroid and near-Earth object of the Apollo group, that passed Earth at approximately twice the distance of the Moon on 30 October 1937. The asteroid was named after Hermes from Greek mythology.[3] It is noted for having been the last remaining named lost asteroid, rediscovered in 2003. The S-type asteroid has a rotation period of 13.9 hours.[7] Its synchronous companion was discovered in 2003. The primary and secondary are similar in size; they measure approximately 810 meters (2,700 ft) and 540 meters (1,800 ft) in diameter, respectively.[5]
Discovery [1] | |
---|---|
Discovered by | K. Reinmuth |
Discovery site | Heidelberg Obs. |
Discovery date | 28 October 1937 |
Designations | |
(69230) Hermes | |
Pronunciation | /ˈhɜːrmiːz/[2] |
Named after | Hermes (Greek mythology)[3] |
1937 UB | |
NEO · PHA · Apollo [1][4] Mars- and Venus-crosser | |
Adjectives | Hermian, Hermean /ˈhɜːrmiən, hərˈmiːən/ |
Orbital characteristics [4] | |
Epoch 27 April 2019 (JD 2458600.5) | |
Uncertainty parameter 0 | |
Observation arc | 80.94 yr (29,565 d) |
Earliest precovery date | 25 October 1937 |
Aphelion | 2.6878 AU |
Perihelion | 0.6226 AU |
1.6552 AU | |
Eccentricity | 0.6239 |
2.13 yr (778 d) | |
73.583° | |
0° 27m 46.08s / day | |
Inclination | 6.0670° |
34.217° | |
92.746° | |
Known satellites | 1[5] (P:13.892±0.006 h)[6][7] (D: 0.54 km,[8] 0.56 km[9]) |
Earth MOID | 0.0043 AU (1.6752 LD) |
Physical characteristics | |
Mean diameter | 0.8±0.1 km[6] 0.81 km (derived)[5] 0.85 km[7][10] |
Mean density | 1.6 g/cm3 (assumed)[5] |
13.894 h[11][12][lower-alpha 1] | |
0.25±0.12[5][11] 0.265±0.099[6] | |
S [13][lower-alpha 2] · Sq [7][14] | |
17.48[6] 17.5[1][4] 17.55[15] 17.57[7][11][16] | |